inftrees.h

/* inftrees.h -- header to use inftrees.c * Copyright (C) 1995-2005 Mark Adler * For conditions of distribution and use, see copyright notice in zlib.h *//* WARNING: this file should *not* be used by applications. It is part of the implementation of the compression library and is subject to change. Applications should only use zlib.h. *//* Structure for decoding tables. Each entry provides either the information needed to do the operation requested by the code that indexed that table entry, or it provides a pointer to another table that indexes more bits of the code. op indicates whether the entry is a pointer to another table, a literal, a length or distance, an end-of-block, or an invalid code. For a table pointer, the low four bits of op is the number of index bits of that table. For a length or distance, the low four bits of op is the number of extra bits to get after the code. bits is the number of bits in this code or part of the code to drop off of the bit buffer. val is the actual byte to output in the case of a literal, the base length or distance, or the offset from the current table to the next table. Each entry is four bytes. */typedefstruct {
unsignedchar op; /* operation, extra bits, table bits */unsignedchar bits; /* bits in this part of the code */unsignedshort val; /* offset in table or code value */
} code;
/* op values as set by inflate_table(): 00000000 - literal 0000tttt - table link, tttt != 0 is the number of table index bits 0001eeee - length or distance, eeee is the number of extra bits 01100000 - end of block 01000000 - invalid code *//* Maximum size of dynamic tree. The maximum found in a long but non- exhaustive search was 1444 code structures (852 for length/literals and 592 for distances, the latter actually the result of an exhaustive search). The true maximum is not known, but the value below is more than safe. */#define ENOUGH 2048#define MAXD 592/* Type of code to build for inftable() */typedefenum {
CODES,
LENS,
DISTS
} codetype;
externint inflate_table OF((codetype type, unsignedshort FAR *lens,
unsigned codes, code FAR * FAR *table,
unsigned FAR *bits, unsignedshort FAR *work));